Most male contraceptives take months to work, but a new approach stops sperm in under an hour, by blocking an enzyme they need to swim. In mice, one dose was 100% effective What is Penile Vibratory Stimulation? Male birth control developed in conjunction with Bay Area startup now in 1st phase of human testing in UK ABC7 San Francisco WASTED Researchers have introduced a potential breakthrough in male birth control: an injectable, non hormonal contraceptive known as ADAM. Instagram Most male contraceptives take months to work, but a new approach stops sperm in under an hour, by blocking an enzyme they need to swim. In mice, one dose was 100% effective